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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d9272e499de2e2180ffd3d4b39ae1dbcdf531f4f18c809f356471b997a1a06' 
  AND token = '0ARFypqy/JR4dI6mR00lPmg0R1O+N6WLVa/jl7iU7/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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