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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886582ba83b3b18705643c111f613fa13970cda74de5a9eb05a618a6f3975321' 
  AND token = 'OW9j+WnT1G4ZZFkuUpG5HNSSapXLfz4sS8zf24GuWwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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