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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73b4a64d4b6f8d1a127083b74a97e9da0fefda7880d83c8da1ca78e4af92aae7' 
  AND token = 'WtsWdrs92qhAU2Vcnaq5JOz5JqbNGE14jApdlF+f5oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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