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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48d67f57f90f991334e60691607ca9f9d026e3496b7c80a584bf23c1d3c3aec' 
  AND token = 'yeGw9hn7DH3jVIAgqFU9B7wp0HDtq9PxAEatZw0lbcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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