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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118b6e9c9f5ce68a0dda4c361149d75f824f5db90cba312973f5c5d00326529d' 
  AND token = 'mp8oAO1jxOhmF5oxPMgKGr8CeGW0dN7OWgwVqyIsYV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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