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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6b3364978c118b610927ec8ae0eeb29fba9f4af985ce06e4d771ec1269b70c' 
  AND token = 'yv4nyUtXm8BABFSGC1SHlChM4n1YV2smHsNl30tLCL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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