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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79da70c64550cf3a66a19abf1d0b230524a17cad2eba7c97852d9e61a529ea45' 
  AND token = '53C3x5d97hkh0+mBRiLDOHLycEtnNvilFiI5H346KHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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