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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650dbd843c917a9120a538dfe772e42fef68c30f305d9dc9b89baaab2e4c25ba' 
  AND token = 'mLAzAv5+pxQgPe0RIN2wO7pJg0LHN5AJ8/+GP+MJJok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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