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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790da5424ea65b152c685f65f8999405fc6de36f482fb0933a0a69097afa6310' 
  AND token = '6PnXcIyhwnmPWrIf9qkeTzEcNEJO/Nnamouv3Oj+Tc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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