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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbde57b33ffbdfd13eb55f1a8f1e159ef650de25251632486cbba6db42a2939' 
  AND token = '2Mur9qtVHMECYd4z2owxzYxHZeIAVt+6G4LSHiJqqyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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