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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215d1edef3f23cc0f64836497f32c3daf80f583eb4c742a1aa624f021a782fe7' 
  AND token = 'QUmpBNBWPrGbsSygWgxVdcltka9WYakLMW1apMia4Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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