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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '156695cf0790c5e107d5bc1ce237ef042167cce0cca8129972caccc6c6f063d7' 
  AND token = 'GgkECkoN77/RdgTXJIKjHg2UfPGFe5CI8KyfvuoNhwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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