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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b9d65dcdcc9e9c0133c2912ba7ae5174657c298279cfedef2d2975c64b5d10' 
  AND token = 'Kca+sYIC4VMkQCmwldKseGoId6BT3is2kVEqDyc9P+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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