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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba18ab515530fc86a1890356ee42d55671ba16a79f0f77ddb7b2634dcb1aff1' 
  AND token = 'GItx7LP3RrVwvO3YBYytLxrHPespFAa9U1RA/2naLwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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