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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0926280d3be79b52577234b38cdd83e4879e196e479ebf1f72dec9111409244a' 
  AND token = '0TEBns1nhvUrXj1muwP+0r1COzTr+YZqlNmhIc1AqTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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