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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd0a4417d4dae5db6fd13eb604f246cf29369e0f72ceb8667b7323612a136f9' 
  AND token = '+eM63jgkDsqk1LB4xVwu2gkzXKnQtsnPe+yxt7kQwzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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