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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5555043f66211ddabcb93094163b8cf322db695092b329e2431449c8b07b9089' 
  AND token = 'rp34JeeYj7V5eUeeX4Fe5l9G1pgMwdromubmbQSwSAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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