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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b8a773a5bd0d71d97d6fb11b1350a71b7dbde91f27898a52950090338fee72' 
  AND token = '2AFme6iaTcJpPpWPx4SQCmAeRpwx54+2w8G32SOqtJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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