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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cd11480e48b707881eddf9bf617997cf139a7a0c3f226493ed924155044613' 
  AND token = 'MZNDA77BF5R8RDgDtSAFiKsuKUCrMuahm1KWBKCeuD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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