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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0ac7abe9a5ea3f3d9b578c67d5981cde9650cbe8bca8f33a5e60f4f917bf15' 
  AND token = 'gV6hOMkz4moPjiFraQKlIU3z3Fr6KxR6lUR80ze3rG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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