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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ac30d1cb0e0dd4baa6ab08d2df29fdab8ce4d89486b0b185cfd2107259265ab' 
  AND token = 'oYQgb7GrLmrf2njNDWKUroHrPCQDAnS784JnD+UIcFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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