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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f459dc07735e2270b70b4258be08187e2a414ddd8e06ef72289284dcc721e93' 
  AND token = '57dFarbCrYRYEAVl3Z5wp2v4FMruG0N6E4jJEofC2IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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