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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbd7d4be801fd20c29337609223c2ded5c18695658a8aad1a1b863fb4975880' 
  AND token = 'GzBdR3Pj6+BrWNX1ba7JNMAmy+8F+o9POYXia871HZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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