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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eef37c4bf25bc2b1550c37d3aa2838b3e3969ac787178a066bd44d4823045f5' 
  AND token = 'bZr10shVS7eOkKsS0cLfIqWnjoNYWOICUlUDJva2uks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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