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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad32f610d3f3c2c3cc47a6277da652c99352d2dfcc69d7dc018f51edfbc5b11' 
  AND token = 'Oc2x8Vr4TypcEI3urix5bkxulZONcmvjiWy+28G91gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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