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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cc8ad0a0db13cbd353636e7418285e52cd32ed24f15a9023ea92327157d1e7' 
  AND token = '/qDaMi156i3TWgl/LIFXHqcp8DYmFcqOhYoLeB/OcPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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