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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ea0b2aca1eb0aa1a8fe4463a68b224a1b703506fab8d3d1b5ca9ef32135d531' 
  AND token = 'Tl8SwvJQESrQ+izErBHDgwAhIVlZLGnPneKMRl0e6kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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