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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac76ac6a68839bc2ca90f9b5b5a8d4a98d67f78f8436432f0b813839dfe2d1a' 
  AND token = 'Gr/yirYTM6yOAz4+KSu10q8IFDIYyOfefEjzrLDhlKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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