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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae05ff324a94612b0b9f2c699fbf899aee8895faad8092e8880230843d6b4df1' 
  AND token = 'UKAy42bFdjId6yJ9SBIKD/0YaT+Rv2mYOf51mCNVMco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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