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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93131b6f321d7873b8ffb7815cefd50898d1d18faa95d17253949984f94aa43' 
  AND token = 'MwNFnq1AhdTCsIlChX8PsosM4Vek+SQ5rs4cYSuIIKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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