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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e184c95d0db815ac8c467231788454b5bb9556a59af57b4bc8f9008c19070c4c' 
  AND token = 'lHaOdyF0w1KQnlsNQLIw+W0HGYP445Gvu37lx6Ah/zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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