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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff42c7eb6c7bcf59ce5e86d7928e6b2f08d6107cb7ae230c70964d900c77ad5' 
  AND token = 'kC4CdztvctGfSW7AOpUeqqwN4BrUralVTCTHGBQ1waM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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