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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0daee1f2ff43b67134546507b4df78883edd005820c9c4cc4f2892af18e4263' 
  AND token = 'Iedtpku08x/+1g3PP1o7gPLERQ05iMoO59btbhGB3Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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