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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38f9cc6e1434b8872a7787a9037116eca73986db1bf5cfa451b2d550fdf8c0b' 
  AND token = 'It2PuzNnziITrHmUR5NWVrCCng4SLDPMogO6Q8yrmZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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