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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffbfca2382ee1dbc4050cbe8cdd1d7891fc6195b46c5c95ea9fe7b31e1335a9' 
  AND token = 'LCnsuKYiVHxlHuhVnYGlbBub0gSqaalAGKtg4itCZqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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