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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b65fddf6b62f7a497bd6b9986233286efb6dfff5a68bd6943f1a824869e7829' 
  AND token = 'U+xac5j4xNTM6KpqVv7LZTycpeZa+CxhSli1LB70BpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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