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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd62ad873268e172af1fe50b947504f29e0158c0f53d77ee7fdd839813905bf' 
  AND token = 't8zZUXF142RJtFtHuCrWvT395S9JX97A1VwXiVuK2N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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