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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba11bd21ce76e119f482508b0e0a9a98a203dca4d8cb9e664d39fcf0fadcf432' 
  AND token = '2ce9IBvD+G4KdIiJnuTsT4adNwLsqtdMZ+FMCD3ZxV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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