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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c2612b041be33cc93df2c2c4f263443051d004fb6aadfc7fec7fdf3953cac8' 
  AND token = '/OWBBAjQP3F3reIQqTZ0V8szldL2iBxSGzgyZLrc7x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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