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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7c55d3f38395cbdac13eca2f41ff65570333f0c80c0892375e6fc88f51c88f' 
  AND token = 'f2Owc/d130xd9A5Zu3sXT7udUSAGbPavHB4bTweajCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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