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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b810f31effe20fa29bd8081b873d8cecba7fbb3e3c05a583a8fb4ac91a96af' 
  AND token = 'dEoful4dLbRBm6sCZ8XKM2y8C/DQ92CCxyfqGCezE58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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