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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afbc0b26b48ce375393ac3ef6a01a7232c6370e61655f706a8a2cff24ef3f64c' 
  AND token = 'zZV12v3ybgFCmW5WHBl5wmmEhzHVSV3NDNPbfVwn5+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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