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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0aaab7f19b783d252df719f0305a9bff46100b5036ef592d2ac38de9b9468a7' 
  AND token = 'TVmNTplmpNVw+vo67SireEYB3pLBvXT7I0kou8fq8XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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