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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb60de0e8df38ad531d22f11030fe5169740a0b2607e452a5f70e3fd7d3fe6d6' 
  AND token = 'Oq2I9uju8Q3kahVfFk8c2iBsBAmRVt71RSd1uVnFduQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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