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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb025207d4700ce6ae75000f4a09379a8f4d72db4cca218464f79e755fbf0db3' 
  AND token = 'ywmt7iBGmBDdj0bOfziBmR3bXFqSm5g2L0lotUeNm8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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