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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf94c2337fd548bcbfeb70323103edbf3dab8445d0de519c618b7d40612563c4' 
  AND token = '++stzHc+bAcuicY04ihPRL+MyjRhCjfnV4Bau0+5+zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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