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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93370ce2d572f54d119ff14e0b995af9027caf299fb1eb6a6a6e0c972aabfdc' 
  AND token = 'LI8T2rymVujuMUNitaG72oZc1XUhVpUf17XE4KaRybY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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