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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81aaf29064d5a0e069bc5ec948040f7d7976df3188f7b6cf5ef70fbb29d3a571' 
  AND token = 'WukhkWtXEr0VpPBUIlKfPHNhSq1GxH3lHhOPICCzOFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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