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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9e9b382478f5c678e53827428d761395fc3a1f8cfe970942270d50db81e615' 
  AND token = '1c+awEA89mApw8ibpafkJmPInreh4YrvYMxTB04s6Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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