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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5d83547001b0b5171abb50ef256af2ed6ade3d6f70a62b67a8fce3dfbcc9c7' 
  AND token = 'i0rJzUR2LxrtqptYy4ClYLi4A2nKjqMEFfjQStrM4ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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