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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddc77797211c3d4df4e03c42bf9a04bd4f2d87c14bc80c5a6b173a573334455' 
  AND token = 'l0oifZq3vrnPKSnV0VPoVaAqpkMHKYXVPulhKBoKpcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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