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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec90ac929bcdea2b9a4e69cc10d9079ee8b9df38af359cc594a40b4fe22064f0' 
  AND token = '11g+bAM611buPCW5fFSwWN0wrUO6ZIdtbKwCWM2LQc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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