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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f485a42402b5711e81a6e0c75598d886fb57e81bca4b26a312268b1f632841c5' 
  AND token = '13znJZwxDLe4geNdAGmN+2g+FbyJw1UuW7dD6L04pQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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