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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93514466dcc4d8ff07d8f84bbe19047dee63a2276e6084e629217679dbdbd608' 
  AND token = '/7VEPQ/lYXpI2wu9k3JcD+X0ky+4F9/dHO0Hn0x1PGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}