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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '795691d6b603f2a39f99affc04395e97f4c76e20c2b84229cd90124a0ad880d5' 
  AND token = 'YeFlazUe3viA1qlPvLlFIRY0vhCJfdLAxoL001sQc6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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