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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b119f74eedf948a14920d53bc98619ae3aabf623fba11206b6cf97706e682f8' 
  AND token = 'zHCmVptvU7SppKRlQB/334Wa48N6IGbVJlOdvVCdeUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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