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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fff91fd048c2303319be42bad9ed94e775648dd0d1783ce68ecccdf8cea6e3e' 
  AND token = 'TaPVsBCN22Hr6KG6YiLUfoNiZ8yIfJyi2Jle5J8KY2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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