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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b28802edf2b2b244af0f123fc9488593f2e4ff66ae2ac4aeb19c67a1d99f5ba8' 
  AND token = 'ODxdZXH0VWtE2pRp0t4RDkPtmAMybC04DOPswMGjveg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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